There may be a case when you have first used ‘Portfolio Designer’ plugin with your staging server and you have registered your key with your staging server.
Now when you move your site to live server, you need to deregister your license key with staging server before registering with your live server. At a time license key can be used in one site only.
Follow below steps to deregister License key from your staging server.
Go to the admin side of your WordPress site (Staging Server). Then click on the menu ‘License Key’ under ‘Portfolio Designer’ section.
Then click on ‘De-Register Product’ tab on this page. You will get one form to register/de-register License Key.
Click on ‘Deregister License’ button to deregister License Key with the current site.
NOTE: If you have not deregistered your license key with staging site and your staging site is no more available, then create a support ticket at http://support.solwininfotech.com/. We will help you.